The Iraq War returned to the headlines this week. That's largely because of Donald Trump's fight with the family of Humayun Khan, the Muslim-American soldier killed in Iraq a little over a year after the U.S.-led war began in 2003.

Trump and his supporters say people should blame Hillary Clinton for Khan's death, because she voted for the use of force against Iraq in 2002 when she was a U.S. senator from New York.